automatically fix linting errors

Author: ichiriac

package.json

@@ -12,7 +12,7 @@
   ],
   "scripts": {
     "lint": "eslint 'src/**/*.js'",
-    "pretest": "npm run lint",
+    "pretest": "npm run lint -- --fix",
     "test": "jest",
     "prebuild": "npm run test",
     "build": "webpack --config webpack.config.js",